preload external dataset, model, agent
Merge branch 'master' of github.com:ooici/coi-services into preload_external_data
Adds udunits
Fix node_exclusive handling in process dispatcher

Test and fix for OOIION-816
Merge branch 'master' of github.com:ooici/coi-services into preload_external_data
Release Version 2.0.19
Bump Version to 2.0.20-dev
Merge pull request #918 from labisso/OOIION-816

Fix node_exclusive handling in process dispatcher
Updated setup.py
Add route to SGS to delete attachments
Return value from RR delete attachment
Bump ion to include workflow timeout
Bump ion again
Release Version 2.0.20
Bump Version to 2.0.21-dev
update device extended resources to reflect current aggregate and rollup status design
Merge branch 'master' of github.com:ooici/coi-services
Now properly handling the agent parameters aparam_rollup_status and aparam_child_agg_status for propagation of updates triggered by a DeviceAggregateStatusEvent from a child. New test test_platform_status_small_network_5 to verify the propagation with a multi-level 5-platform network.
merge upstream/master
adjust comment